适用于渤海绥中油田含聚污水的高效清水剂

Efficient Water Clarifier Suitable for Produced Water of Polymer Flooding in Bohai SZ36-1 Oilfield

渤海绥中油田三次采油污水中含有阴离子聚合物,存在空间位阻效应,传统聚醚嵌段型清水剂具有清水速度慢、药剂用量大、大量黏稠絮凝物黏附于管道壁面及转弯处造成装置堵塞等缺点。以环氧氯丙烷、有机胺为起始剂,乙二胺为交联剂,制得一种高效的季铵盐型小分子阳离子清水剂H1,优化了合成条件,对比了H1与现场应用的清水剂(BHQ-04和BN-5)的清水效果。结果表明,环氧氯丙烷、有机胺、乙二胺投料摩尔比为1.2∶1∶0.3时,在75℃下反应5数6 h制得的清水剂清水效果最佳;与现场用清水剂相比,H1油水分离速度快、油水分离后的上层絮状体松散且可自由流动,有效清水浓度为175 mg/L,远低于BHQ-04的400 mg/L和BN-5的300 mg/L。H1清水剂有效解决了渤海绥中油田区块含聚污水处理过程中的黏性油泥问题。

Tertiary oil recovery sewage in Bohai oilfield contained anionic polymer,which had space steric effect. The traditional polyether block type water-clearing agent had a slow water-cleaning rate,large dosage of reagents,and a large number of sticky flocs adhering to the wall of pipeline and causing blockage of device. With epichlorohydrin and organic amine as the initiator,and ethylenediamine as the crosslinking agent,a new high-efficiency quaternary ammonium cation water clarifier H1 was synthesized by controlling reaction condition. The clear water effect of H1 and detergents（BHQ-04 and BN-5）used in field was compared. The results showed that water clarifier H1 had the best water-cleaning effect which synthesized on the condition of 1.2∶1∶0.3 the molar ratio of three ingredients（epichlorohydrin∶organic amine∶crosslinking agent）,5—6 hrs reaction time and 75℃. The effective purifying concentration of H1 was only 175 mg/L,which was far lower than that of BHQ-04（400 mg/L）and BN-5（300 mg/L）.Compared with BN-5 and BHQ-04,H1 had higher oil-water separation speed and better flowability,and the upper flocculent was loose and free flowing after oil and water separation. The synthesized water clarifier H1 had the ability to prevent the formation of sticky silt during effluent treatment of polymer flooding in SZ36-1 reservoir of Bohai oilfield.